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HYDRONICS HEATING AND COOLING
STUDY GUIDE
What-is-the-definition-of-human-comfort-relative-to-temperature?---ans-✔✔When-you-feel- neither-warm-nor-cool. pg.- 1 Which-type-of-hydronic-system-would-use-gravity-flow?---ans-✔✔Low-temperature- heating. pg. Describe-a-hydronic-system.---ans-✔✔Heating-and-cooling-system-that-uses-water-or- HTF-as-a-heat-transfer-medium. pg. Brine-or-a-water/glycol-mixture-is-commonly-referred-to-as___.---ans-✔✔HTF pg. In-which-year-did-Willis-Carrier-patent-the-dew-point-control-system?---ans-✔✔ 1907 pg. How-many-BTUs-are-required-to-heat-one-lb-of-water-from-32F-to-212F?---ans-✔✔ 180 - BTUs pg.- 22 In-order-to-provide-accurate-indoor-temperatures-the-heat-supply-to-the-building-must-be- equal-to___.---ans-✔✔Heat-loss-of-the-building pg.- 5 What-are-the- 4 - types-of-heat-transfer---ans-✔✔Conduction,-convection,-radiation,-and- evaporation. pg.- 14 Calculate-the-GPM-for-an-80MBH-heat-load-using-water-as-the-HTH-with-a-change-in- temperature-of-20F.---ans-✔✔GPM=btuh/(Delta-T-X-specific-heat-X-500) GPM=80,000/(20-X- 1 - X-500) GPM=80,000/10,
GPM=
pg.- 22 How-is-TEL-(total-equivalent-length)-measured-and-calculated?---ans-✔✔Measure-the- longest-circuit-and-add-50%-for-fittings-and-terminal-units. pg. Which-type-of-heat,-when-added-or-removed-from-a-substance-creates-a-change-of- state?---ans-✔✔Latent-heat pg.- 18 Define-humidity.---ans-✔✔The-amount-of-moisture-in-the-air. pg.- 24 What-is-dry-bulb-temperature?---ans-✔✔Temperature-of-air-taken-with-a-standard- thermometer. pg.- 25 Which-tool-is-used-to-determine-relative-humidity?---ans-✔✔Sling-psychrometer Pg.- 34 How-is-rate-of-flow-measured?---ans-✔✔Gallons-per-minute-(GPM) pg.- 48 Select- 3 - types-of-heat-transfer.---ans-✔✔Radiation,-convection,-conduction pg- 15 Which-heat-transfer-describes-the-condition-when-a-body-loses-heat-to-cooler-surfaces?--- ans-✔✔Radiation pg- 15 What-is-the-pressure-of- 1 - ft-of-water-(vertical)?---ans-✔✔0.433-psig/ft pg- 45 -is-any-pressure-less-than-atmospheric.---ans-✔✔Vacuum pg- 42 Pressure,-according-to-the-height-of-a-liquid-is-called-.---ans-✔✔Static-head Convert-92'-of-static-head-to-psig.---ans-✔✔ 92 - X-0.433=39.836-psig pg- 46 Any-pressure-above-a-perfect-vacuum-is-measured-as___---ans-✔✔Psia pg- 42
What-would-be-the-correct-valve-that-would-be-used-to-regulate-the-rate-of-HTF-flow-in-a- piping-system?---ans-✔✔Balancing-valve pg- 81 Name-the- 4 - main-components-of-a-chiller-system.---ans-✔✔Compressor,-condenser,- evaporator,-refrigerant. pg- 87 These-devices-would-be-included-in-a-make-up-water-system.---ans-✔✔Pressure- reducing-valve,-back-flow-preventor,-isolation-valve pg- 75 What-is-LWCO?---ans-✔✔Low-water-cut-off pg- 71 Which-boiler-has-the-highest-output-rating? -Cast-Iron -Scotch-Marine -Condensing -Electric---ans-✔✔Electric pg- 61 What-device-is-used-to-protect-a-potable-water-system-from-cross-connections?---ans- ✔✔Backflow-preventer pg- 77 A-condenser-acts-as-a-type-of-.---ans-✔✔Heat-exchanger pg- 87 Low-pressure-boilers-are-classified-by.---ans-✔✔ 15 - psig-steam-and- 160 - psig-water pg- 51 Low-pressure-boilers-have-a-specific-pressure-and-temperature-limits;-what-is-the- maximum-pressure-temperature-limit-for-these-boilers-(ASME)?---ans-✔✔ 15 - psig-steam,- 160 - psig-water-at-250F pg- 51 What-type-of-device-is-attached-to-the-boiler-to-assist-in-the-management-of-air-in-the- hydronic-system?---ans-✔✔Boiler-fitting pg- 70 What-type-of-boiler-uses-microprocessor-controlled-combustion-which-automatically- adjusts-air-fuel-mixture?---ans-✔✔Condensing pg- 59
What-device-protects-the-boiler-from-pressures-above-maximum-design-pressure?---ans- ✔✔Relief-valve pg- 67 Fuel-oil-burners___-fuel-oil-to-increase-contact-with-combustion-air-for-maximum- efficiency.---ans-✔✔Atomize pg- 53 What-does-the-ASME-Boiler-Pressure-Vessel-Code-require-if-the-output-of-a-boiler-is- 400,000-btuh-or-more?---ans-✔✔LWCO-(low-water-cut-off) pg- 72 An-output-rating-is-the-total-amount-of-heat-a-boiler-will-produce-in____.---ans-✔✔ 1 - hour pg- 61 What-is-the-device-that-can-be-used-to-both-heat-and-cool-an-area?---ans-✔✔Heat-pump pg- 61 When-a-heat-pump-is-in-cooling-mode,-the-outdoor-device-is-the____---ans- ✔✔Condenser pg- 61 As-a-vapor-is-compressed-in-a-refrigeration-system-what-happens-to-the-refrigerant?--- ans-✔✔Temperature-increases pg- 84 In-a-compression-refrigeration-system,-where-is-the-heat-absorbed?---ans-✔✔Evaporator pg- 84 The-hydronic-cooling-cycle-is-composed-of___-separate-and-distinct-cycles-that-create- the-compete-system.---ans-✔✔ 5 pg- 83 What-type-of-flow-has-better-heat-transfer-in-a-coil?---ans-✔✔Counterflow pg- 100 A-rule-of-thumb-(ROT)-can-be-used-to-calculate-fill-pressure-of-a-hydronic-system;-when- using-the-ROT-what-is-considered-a-standard-height/floor?---ans-✔✔10ft What-are-the- 3 - functions-of-a-triple-duty-valve?---ans-✔✔Flow-control-(balancing),-check- valve,-isolation When-connecting-a-make-up-water-fill-line,-what-is-the-best-location?---ans-✔✔The-point- of-no-pressure-change
The-best-place-for-air-separation-is-at-the-boiler;-why?---ans-✔✔Air-bubbles-are-larger,- and-HTF-is-at-a-high-temperature-and-low-velocity A-typical-pressure-at-the-top-of-a-hydronic-system-with-the-pumps-off-would-be___.---ans- ✔✔ 4 - psig A-system-is- 7 - stories-tall-and-it-includes-a-captive-diaphragm-expansion-tank-in-the- basement,-what-is-the-adjusted-tank-pressure?-(10'/floor)---ans-✔✔ 36 - psig Ypu-have-installed-a-1"-ATFL-fitting-with-a-run-of-37'-to-the-boiler-fitting,-what-is-the-correct- size-of-the-pipe?-(use-table-5-10)---ans-✔✔ 1 - 1/2" Select- 3 - ways-air-can-exist-within-a-hydronic-system.---ans-✔✔Air-pockets,-entrained-air- bubbles,-dissolved-gases A-closed-hydronic-system-has-a-static-head-of-30'.-what-is-the-cold-fill-pressure-at-the- pump?---ans-✔✔ 17 - psig Which-of-the-following-flow-rates-is-best-for-air-removal? -10-fps -6-fps -3-fps -2-fps---ans-✔✔ 2 - fps What-location-is-preferred-when-connecting-a-pre-charged-expansion-tank?---ans- ✔✔Suction-side-of-the-pump A-properly-installed-closed-loop-hydronic-system-that-has-been-filled-and-properly- maintained,____-needs-additional-HTF.---ans-✔✔Rarely What-is-the-total-pitch-required-for-a-pipe-connecting-a-compression-expansion-tank-that- is-5'-long?---ans-✔✔1" Which-one-of-these-devices-is-an-example-of-a-final-control? -Zone-valve -Circuit-setter -Triple-duty-valve -Pressure-indicator---ans-✔✔Zone-Valve Which-check-valve-relies-on-a-hinged-disk-within-the-valve-body?---ans-✔✔Swing-check What-is-used-to-relieve-trapped-air-in-a-hydronic-system?---ans-✔✔Air-Vent What-fitting-or-device-is-used-in-a- 1 - pipe-system-to-induce-HTF-flow-into-another-pipe?--- ans-✔✔Diversion-fitting
Combination-balancing-and-purge-valves-have- 4 - basic-functions,-which-of-these-choices- is-not-a-function-of-this-device? -Drain -Control-flow -Temperature-control -Isolation---ans-✔✔Temperature-control What-is-another-name-for-a-Venturi-tee?---ans-✔✔Diversion-tee What-is-an-ASTM-standard-for-steel-pipe?---ans-✔✔ASTM-A Describe-a-full-way-valve-used-to-regulate-flow-in-which-a-threaded-stem-raises-and- lowers-a-wedge-shaped-disc.---ans-✔✔Gate-valve What-valve-allows-fluid-flow-in- 1 - direction?---ans-✔✔Check-valve Copper-is-often-used-in-hydronic-and-refrigeration-systems;-list-the- 3 - types-of-copper- tubing-in-order-of-wall-thickness.-(thickest-to-thinnest)---ans-✔✔K,-L,-M A-U-shaped-section-of-piping-that-absorbs-thermal-movement-is-an____.---ans- ✔✔Expansion-loop What-is-the-maximum-horizontal-hanger-spacing-for-3"polypropylene-pipe?---ans-✔✔4' ____-prevent-piping-in-horizontal-runs-from-sagging-and-leaking.---ans-✔✔Hangers Select-the-best-application-for-a-globe-valve-in-a-hydronic-piping-system. -Isolation,-fully-opem -Throttling-or-flow-control -Isolation-of-a-pump -When-a-gate-valve-doesn't-fit---ans-✔✔Throttling-or-flow-control What-piping-system-is-identified-by-"first-supplied,-last-to-connect-to-the-return?"---ans- ✔✔Direct-return What-is-a-zone?---ans-✔✔A-circuit-that-is-controlled-by-one-thermostat When-using-an-eccentric-reducer-in-a-hydronic-system,-how-is-the-fitting-installed?---ans- ✔✔Flat-on-top-to-keep-the-air-moving What-rule-applies-to-the-branch-takeoffs-when-piping-terminal-units-on-a-one-pipe- system?---ans-✔✔Should-be-the-same-width-of-the-terminal-unit
How-much-sand-cover-is-required-for-a-snow-or-ice-melt-system,-which-will-be-hard- surfaced-with-asphalt?---ans-✔✔1.5" What-should-PEX-tubing-have-to-protect-from-oxygen-infusion?---ans-✔✔Oxygen-barrier Which-statement-is-true? A.-Hysteresis-is-the-rate-of-change B.-Proportional-control-is-the-amount-of-offset-in-a-control C.-Derivative-control-is-the-rate-of-change-in-a-controlled-imput D.-Adaptive-control-is-a-PID-control-algorithm-that-automatically-adjusts-its-parameters- based-on-environment-factors---ans-✔✔D.-Adaptive-control-is-a-PID-control-algorithm-that- automatically-adjusts-its-parameters-based-on-environmental-factors When-servicing-a-system-you-notice-the-pressure-reading-is-higher-upstream-of-a-filter,- what-is-your-best-action?---ans-✔✔Replace-the-filter Lead/lag-control-is-a-control-strategy-that-alternates-the-operation-of- 2 - or-more-similar- pieces-of-equipment.-What-is-a-common-application?---ans-✔✔Multiple-hot-water-or- chilled-water-pumps Which-control-device-converts-one-form-of-energy-to-another?---ans-✔✔Transducer Which-control-system-makes-decisions-based-only-on-the-current-state-of-the-system-and- a-model-of-how-it-should-work?---ans-✔✔Open-loop-control What-is-the-device-used-to-measure-a-controlled-variable-to-transmit-that-measurement-to- a-controller?---ans-✔✔Sensor Select-the-term-which-describes-what-is-monitored-or-changed-by-a-control-system. -Relay -Hysteresis -Variable -Switch---ans-✔✔Variable Which-term-describes-the-range-between- 2 - set-points-in-which-no-control-action-takes- place? -Derivative -Gain -Dead-band -Offset---ans-✔✔Dead-band Which-term-describes-the-point-at-which-a-control-system-will-start-or-stop-an-action? -Dead-band -Set-point -Gain
-Offset---ans-✔✔Set-point When-used-in-conjunction-with-a-controller,-the-actuator-is-considered-what-type-of- device?---ans-✔✔Output How-many-possible-states-does-a-digital-signal-have?---ans-✔✔ 2 When-reading-differential-pressure-across-a-pump,-good-HTF-flow-is-indicated-by____.--- ans-✔✔High-pressure-differential Changing-characteristics-in-a-hydronic-system-are-known-as-.---ans-✔✔Variables What-is-the-definition-of-hysteresis?---ans-✔✔The-relationship-between-rate-of-change-of- an-input-and-the-rate-of-change-of-an-output. A-Pitot-tube-station-measures____.---ans-✔✔Static-and-total-pressure What-describes-a-formal-assessment-of-the-functionality-and-efficiency-of-a-system? -Balancing -Calibration -Commisioning -Pressure-testing---ans-✔✔Commisioning 1/32"-of-scale-buildup-inside-can-decrease-heat-transfer-by____.---ans-✔✔40% What-type-of-glycol-has-the-best-heat-transfer-characteristic? -Algaecide -Isopryl -Ethylene -Propylene---ans-✔✔Ethylene What-glycol-is-used-in-a-food-safe-environment?---ans-✔✔Propylene What-is-the-recommended-solution-of-sodium-carbonate-used-when-cleaning-a-steel- pipe?---ans-✔✔ 1 - lb/30-gal The-Uniform-Mechanical-Code-states-that-system-piping-system-piping-and-components- shall-be-tested-with-a-pressure-of-not-less-than-times-the-operating-pressure-and-not- less-than___psig.---ans-✔✔1.5/ What-condition-can-act-as-an-insulator-and-is-an-accumulation-of-mineral-deposits-on- metal-surfaces?---ans-✔✔Scale What-is-TSP-(trisodium-phosphate)-used-for?---ans-✔✔Cleaning-a-piping-system
